Null references redux + Cyclone

[Walter Bright]

bearophile wrote:
> If even Andrei, a quite intelligent person that has written big books
> on C++, may be wrong on such a basic thing, then I think there's a
> problem.

Not everyone is an expert on everything, and how vptrs and vtbl[]s and 
casting actually work for multiple inheritance is far from being a basic 
thing.

Furthermore, different compilers implement these things differently. 
Last I heard, Java did it the way Andrei described.

Don Clugston wrote an article a few years ago on this, and found a wide 
variety of implementation strategies. The Digital Mars one was the 
fastest <g>.